Method of making glassware.



F.. w. S TE W'ART METHOD OF MAKING GLASSWARI'L APPLICATION FILED OCT. 27. I915- Patented Nov. 20, 191?.

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rmrrnn STATES FREDERICK W. STEWART, 0F BEAVER, PENNSYLVANIA.

' METHOD or MAKING GLASSWARE.

Specification of Letters Patent.

. Patented Nov. 20, 191?.

Application filed October 27, 1915. Serial No. 58 ,220.

To all whom it may concern.

Be it known that I, FREDERICK W. STEW- ART, a citizen of the United States, and resident of Beaver, in the county of Beaver and State of Pennsylvania, have invented a new and useful Improvement in Methods of Making Glassware; and I do hereby declare the following to be a'full, clear, and exact description thereof.

My invention relates to a method ing glass articles.

In the manufacture of certain glass articles where the glass is blown in a two-part mold, a vertical fin will be formed at opposite sides of the article where the moldhalves come together. In order to avoid this, it has been customary to blow such articles in a paste-mold, and by rotating the the blow-pipe during the process of blowing, the fin is obliterated and a perfectly smooth exterior is obtained. I

By the invention, I propose to form a of formblown-glass article in an ordinary iron-mold and obtain an article to all appearances the same as if blown in a paste-mold.

My invention consists, generally stated, in blowing the article in a mold formed in two parts connected b a horizontal joint, so that when the article is blown therein the upper section of the mold may be lifted 01f vertically and the seam which is formed at the point of juncture of the two mold-halves forms a horizontal fin extending around the article, so that by cranking off the portion formed in the lower section of the mold at the point of the'fin and grinding the lower edge of the article, the fin is completely obliterated and the article has the same appearance 'as if blown in a paste mold.

In the accompanying drawings, ll have illustrated the apparatus for carrying out my invention in which Figure 1 is a vertical section of a mold showing the blank therein in position for blowing; Fig. 2

shows the article blown in the mold; Fig. 3

shows the upper mold-section, leavin the article on the lower mold-section; Fig. 4 shows'th'e article with the portion formed in the lower mold-section separated therefrom; and Fig. 5 shows the article on the grinding wheel for finishing the edges.

In the drawings, the numeral 2 designates the lower mold-section and 3 the upper mold-section of a mold suitable for forming a shade 4. The upper mold-section 3 rests upon the lower mold-section 2 and the upneck thereof.

per section 3 has the rim 5, which engages the collar 6 on the lower mold-section. In this manner the upper mold-section is cen bored and held in position. a

The upper mold-section 3 is provided with the handles 7 for lifting and lowering said mold-section.

An ordinary neck-ring 8 is adapted to Iest upon the mold-section 3, and a suitable blow-head 9 is adapted to rest uponthe .'neck-ring, said blow-head being connected up by the blow-pipe 10 to a suitable air-supply. The blow-head is of the ordinary construction having the valve 11, which is raised when the blow-head is-lowered, as indicated in Fig. 1, to permit the air to pass around said valve and through the vents 12 into the mold-cavity.

The blank 13 from which the article is to be formed may be first formed in a suitable press-mold, and said blank suspended from the neck-ring 8 is lowered into the mold with the neck-ring resting on the upper mold-section 3, as indicated in Fig. 1. In order to center the blank, the projection 14 may be formed in the lower mold-section 2.

When the blank has been inserted in this manner, the air is admitted by lowering the blow-head and the. glass is blown out in conformity with the shape of the mold, as in-' dicated in 2. 'A fin will be formed at the point 15 where the mold-halves join. To remove the article from the mold, the neck-ring is opened and lifted, leaving the upper mold-section 3'resting upon the lower mold-section whereupon the operaton by grasping the handle 7 of the upper-mold section 3 lifts the mold-section vertically as in dicated in Fig. 3. The shade 4 is of such shape as to permit of this vertical withdrawal of the upper mold-section.

The articleislifted from the lower moldsection 2 with'a pair of tongs engaging the The lower closed end 16 of the article blown which extends radially beyond the body of the shade, arated from the upper portion by cracking off in the ordinary manner, and as the fin has been formed at 15, this cracking-off operation takes place at a point at or above the fin so that the fin is obliterated. The edge of the shade is then ground by applying it to a suitable grinding-stone 17. J

In this manner, I provide for the formation of a shade or other glass article in an is then sepordinary iron-mold, and at the same time, produce an article free from the vertical fin, which has always been present heretofore on articles of this character blown in an ironmold, and am able to obtain an article which has all the appearances of having been made in a paste-mold.

Instead of first pressing a blank and then inserting it into a blow-mold, it is apparent that the glass maybe gathered on an ordinary punty and blown in the mold without the previous pressing operation.

It is apparent that many other different articles may be ,formed by my improved method, and I do not intend to limit it to any particular shape or size of article.

What I claim is:

1. The method of forming glass articles consistin in blowing the article in a mold compose of non-partible upper and lower mold sections the one resting on the other, and forming a horizontal joint, forming a closed end portion projecting radially bemoving the lower portion of the article at or above the point where the upper and lower mold sections join.

2. The method of forming glass articles consisting in blowing the article in a mold composed of non-partible upper and lower sections, one resting on the other and forming a horizontal joint, forming a closed end portion projecting radially beyond the body of the article, lifting the upper mold section from the article and knocking ofi the lower projectingportion and grinding the edge of the article.

In testimony whereof, I the said FRED- plmodn W. STEWART, have hereunto set my FREDERICK W. STEWART.

Witnesses:

RoBrr. D. TOTTElI, JOHN 18. Wait. 

